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Are my answers logical?

Question asked by Majd Al Mohtar on Jan 12, 2018

I have a wall made of plastic blocks mounted on top of each other, and mounted on top of a rail fixed to the ground. The figure below demonstrates my study:

First, my goal is to apply a linear motor on the middle block to see what motor force breaks the wall. The blocks are made of plastic and the rail is of alloy steel. I wanted to set contact between the parts, so to obtain the contact stiffness between the blocks I different values of a contact force and found the displacement and generated a plot. Same thing for the contact stiffness between the steel and the plastic. My problem is that the contact stiffness between steel and plastic was obtained to be 3*10^6 N/mm. Hence, a huge force is needed to break the wall (about 20000N), yet the wall is made of plastic blocks mounted on top of each other and mounted on a fixed rail to the floor. Is the answer logical?

Because I sense it is not, if not, can anyone help me find my mistake?

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